Long‐range transport of Asian outflow to the equatorial Pacific

Martin, Brian; Fuelberg, Henry E.; Blake, N. J.; Logan, Jennifer A.; Blake, D. R.; Sachse, G. W.

doi:10.1029/2001jd001418

Cited by 37 publications

(30 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…11a the measurement/model ratio and the photochemical age. It is important to note that the 2.2-h age from this analysis is in agreement with back trajectory analysis (see Martin et al, 2003 for a discussion of this approach). The CH 2 O observations in Fig.…”

Section: Temporal Behavior Of Ch 2 O In Fresh Boundary Layer Plumesmentioning

confidence: 48%

Detailed comparisons of airborne formaldehyde measurements with box models during the 2006 INTEX-B and MILAGRO campaigns: potential evidence for significant impacts of unmeasured and multi-generation volatile organic carbon compounds

et al. 2011

View full text Add to dashboard Cite

Abstract. Detailed comparisons of airborne CH 2 O measurements acquired by tunable diode laser absorption spectroscopy with steady state box model calculations were carried out using data from the 2006 INTEX-B and MILARGO campaign in order to improve our understanding of hydrocarbon oxidation processing. This study includes comparisons over Mexico (including Mexico City), the Gulf of Mexico, parts of the continental United States near the Gulf coast, as well as the more remote Pacific Ocean, and focuses on comparisons in the boundary layer. Select previous comparisons in other campaigns have highlighted some locaCorrespondence to: A. Fried (fried@ucar.edu) tions in the boundary layer where steady state box models have tended to underpredict CH 2 O, suggesting that standard steady state modeling assumptions might be unsuitable under these conditions, and pointing to a possible role for unmeasured hydrocarbons and/or additional primary emission sources of CH 2 O. Employing an improved instrument, more detailed measurement-model comparisons with better temporal overlap, up-to-date measurement and model precision estimates, up-to-date rate constants, and additional modeling tools based on both Lagrangian and Master Chemical Mechanism (MCM) runs, we have explained much of the disagreement between observed and predicted CH 2 O as resulting from non-steady-state atmospheric conditions in the vicinity of large pollution sources, and have quantified Published by Copernicus Publications on behalf of the European Geosciences Union. the disagreement as a function of plume lifetime (processing time). We show that in the near field (within ∼4 to 6 h of the source), steady-state models can either over-orunderestimate observations, depending on the predominant non-steady-state influence. In addition, we show that even far field processes (10-40 h) can be influenced by non-steadystate conditions which can be responsible for CH 2 O model underestimations by ∼20 %. At the longer processing times in the 10 to 40 h range during Mexico City outflow events, MCM model calculations, using assumptions about initial amounts of high-order NMHCs, further indicate the potential importance of CH 2 O produced from unmeasured and multigeneration hydrocarbon oxidation compounds, particularly methylglyoxal, 3-hydroxypropanal, and butan-3-one-al.

show abstract

Section: Temporal Behavior Of Ch 2 O In Fresh Boundary Layer Plumesmentioning

confidence: 48%

Detailed comparisons of airborne formaldehyde measurements with box models during the 2006 INTEX-B and MILAGRO campaigns: potential evidence for significant impacts of unmeasured and multi-generation volatile organic carbon compounds

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Additional details about our trajectory model are given in Fuelberg et al (1996Fuelberg et al ( , 2000 and Martin et al (2002). If a trajectory intersected the lower boundary, it was continued isobarically along the surface and possibly lofted later by vertical motion, a procedure similar to Stohl et al (1995).…”

Section: Trajectory Modelmentioning

confidence: 99%

A meteorological overview of the ARCTAS 2008 mission

2010

View full text Add to dashboard Cite

Abstract. The Arctic Research of the Composition of theTroposphere from Aircraft and Satellites (ARCTAS) mission was a multi-aircraft project whose major objective was to investigate the factors driving changes in the Arctic's atmospheric composition and climate. It was conducted during April and June-July 2008. The summer ARCTAS deployment was preceded by a week of flights over and around California to address state issues of air quality and climate forcing. This paper focuses on meteorological conditions during the ARCTAS Spring and Summer campaigns. We examine mission averaged large-scale flow patterns at the surface, 500 hPa, and 300 hPa and determine their departures from climatology. Results from runs of the Weather Research and Forecasting (WRF) model are used to describe meteorological conditions on individual days. Our WRF configuration included a nested grid approach that provided horizontal spacing as small as 5 km. Trajectories calculated from the WRF output are used to determine transport pathways to the Arctic, including their origins and the altitudes at which they reach 70 • N. We also present backward trajectories from selected legs of individual ARCTAS flights. Finally, the FLEX-PART Lagrangian particle dispersion model, with the high resolution WRF data as input, is used to determine the paths of anthropogenic and biomass burning-derived CO. Results show that there was frequent and widespread transport to the Arctic during both phases of ARCTAS and that the three ARCTAS aircraft sampled air having a multitude of origins, following a myriad of paths, and experiencing many types of meteorological conditions.

show abstract

“…Although the 15 and 5 km nested data were not used explicitly, the nesting did influence the 45 km parent grid through two way interactions. Additional details about our trajectory model are given in Fuelberg et al (1996Fuelberg et al ( , 2000 and Martin et al (2002). If a trajectory intersected the lower boundary, it was continued isobarically along the surface and possibly lofted later by vertical motion, a procedure similar to Stohl et al (1995).…”

Section: Trajectory Calculationsmentioning

confidence: 99%

Anthropogenic emissions during Arctas-A: mean transport characteristics and regional case studies

et al. 2011

View full text Add to dashboard Cite

Abstract. The National Aeronautics and Space Administration (NASA) conducted the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARC-TAS) mission during 2008 as a part of the International Polar Year (IPY). The purpose of ARCTAS was to study the factors responsible for changes in the Arctic's atmospheric composition and climate. A major emphasis was to investigate Arctic haze, which is most pronounced during winter and early spring. This study focuses on the spring phase of ARCTAS (ARCTAS-A) that was based in Alaska during April 2008. Although anthropogenic emissions historically have been associated with Arctic haze, biomass burning emissions dominated the ARCTAS-A period and have been the focus of many ARCTAS related studies.This study determines mean transport characteristics of anthropogenic emissions during ARCTAS-A. Trajectories are initiated each day from three significant regions of anthropogenic emissions (Asia, North America, and Europe). The fifteen day forward trajectories are calculated using data from the Weather Research and Forecasting (WRF) model at 45 km horizontal resolution. The trajectory calculations indicate: origins of emissions that reach the Arctic (defined as north of 70 • N) within fifteen days, pathways of these emissions, Arctic entry locations, and altitudes at which the trajectories enter the Arctic.Three cases during the ARCTAS-A period (one for each of the regions above) are examined using backward trajectories and chemical fingerprinting based on in situ data sampled from the NASA DC-8. The fingerprinting utilizes volatile Correspondence to: H. E. Fuelberg (hfuelberg@fsu.edu) organic compounds that represent pure anthropogenic tracers, Asian anthropogenic pollution, incomplete combustion, and natural gas emissions. We determine flight legs containing anthropogenic emissions and the pathways travelled by these emissions. Results show that the DC-8 sampled anthropogenic emissions from Asia, North America, and Europe during the spring phase of ARCTAS. The pathways travelled by these emissions agree with our derived transport characteristics and previous studies of Arctic transport. Meteorological analysis and trajectory calculations indicate that middle latitude cyclones and their associated warm conveyor belts play an important role in lofting the surface based emissions to their sampling altitude in all three cases.

show abstract

Long‐range transport of Asian outflow to the equatorial Pacific

Cited by 37 publications

References 42 publications

Detailed comparisons of airborne formaldehyde measurements with box models during the 2006 INTEX-B and MILAGRO campaigns: potential evidence for significant impacts of unmeasured and multi-generation volatile organic carbon compounds

Detailed comparisons of airborne formaldehyde measurements with box models during the 2006 INTEX-B and MILAGRO campaigns: potential evidence for significant impacts of unmeasured and multi-generation volatile organic carbon compounds

A meteorological overview of the ARCTAS 2008 mission

Anthropogenic emissions during Arctas-A: mean transport characteristics and regional case studies

Contact Info

Product

Resources

About